Supervisor IC monitors supply voltage and 2 adjustable inputs.
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Press Release Summary:
With polarity selection and buffered reference output, Model LTC2919 monitors 2 positive or negative supplies for undervoltage and overvoltage conditions. Two inputs have nominal 0.5 V threshold and ±1.5% accuracy. In addition, LTC2919 monitors supply voltage at 2.5, 3.3, or 5 V at fixed -10% UV. Adjustable trip thresholds are set with external resistive divider network. Offered in MSOP-10 and 3 x 2 mm DFN-10 packages, supervisor draws 50 µA and operates from -40 to +125°C.
Original Press Release:
Precision Triple Supervisor Monitors Positive or Negative Supplies for Overvoltage & Undervoltage Conditions
MILPITAS, CA - February 26, 2008 - Linear Technology Corporation introduces the LTC2919, a versatile triple supervisor that monitors its own supply voltage and two adjustable inputs. Polarity selection and a buffered reference output allow the LTC2919 to monitor a combination of two positive or negative supplies for undervoltage (UV) and overvoltage (OV) conditions. The two inputs have a nominal 0.5V threshold and tight ±1.5% accuracy over the full temperature range. In addition to monitoring the two adjustable inputs for UV or OV, the LTC2919 monitors the supply voltage at 2.5V, 3.3V or 5V at a fixed -10% UV. The adjustable trip thresholds are set with an external resistive divider network, giving users complete control over the trip point. Offered in the tiny MSOP-10 and 3mm x 2mm DFN-10 packages, this supervisor draws only 50uA. With guaranteed specifications across the -40°C to +125°C temperature range, the LTC2919 can be used in a wide variety of designs, including network servers and multirail systems.
The LTC2919 includes a common open-drain reset output and two open-drain comparator outputs that indicate the status of the adjustable inputs. The individual comparator outputs simplify sequencing positive and negative supplies. The reset timeout period can be set to a fixed 400us, fixed 200ms, an adjustable period, or disabled for fast response. Glitch filtering ensures reliable reset operation without false triggering and the LTC2919 guarantees the reset output once VCC rises above 0.5V. In addition to monitoring low voltages, the LTC2919's VCC supply includes a 6.5V shunt regulator, which when connected to an external current limiting resistor, allows a high voltage supply to power the device. This makes the LTC2919 a good fit for multichannel low voltage designs and high voltage positive or negative monitoring.
The LTC2919 is available today in commercial, industrial, and automotive temperature grades, with pricing beginning at $1.75 each, in 1,000-piece quantities.
Summary of Features: LTC2919
Two Low Voltage Adjustable Inputs Monitor Overvoltage or Undervoltage Conditions
Accurate VCC UVLO for 2.5V, 3.3V and 5V Systems
Open-Drain RST, OUT1, OUT2 Comparator Outputs
Pin-Selectable Input Polarity Allows Negative, UV or OV Monitoring
Guaranteed Operation to 125°C
Guaranteed Threshold Accuracy: ±1.5%
6.5V Shunt Regulator for High Voltage Operation
Buffered 1V Reference Output for Negative Monitoring
Low Quiescent Current: 50uA
Adjustable Reset Timeout Period
Tiny MSOP-10 and (3mm - 2mm) DFN-10 Packages
About Linear Technology
Linear Technology Corporation, a manufacturer of high performance linear integrated circuits, was founded in 1981, became a public company in 1986 and joined the S&P 500 index of major public companies in 2000. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, uModule(TM) products, and many other analog functions. Applications for Linear Technology's high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems. For more information, visit www.linear.com.
LT, LTC and LTM are registered trademarks and uModule is a trademark of Linear Technology Corp.
North America and General Information
John Hamburger
Tel: (408) 432-1900 ext. 2419
jhamburger@linear.com
Doug Dickinson
Tel: (408) 432 1900 ext. 2233
ddickinson@linear.com
